"MAC"

iTrader: (1)

I thought the VVT of the L99 made as much or more power than the ls3 when modded? Correct me if im wrong please.

LS1nut346

This would be great if it was just a bolt on and could use the old fuel systems. Having to buy new computer, fuel system, etc adds to the cost significantly.

rkreigh

the heads look great but aren't exactly flow bench heros

you can plug the di and use a different intake with injector bungs

I'd like to see the new LPE intake, it has injectors for a secondary injection system I believe or fab one up

I'm not down with the expense of the DI to make power in comparison to LS3 head which is pretty good

I'm looking for good deals on LSA heads if anyone has some

redbird555

iTrader: (14)

Who keeps saying the lt1 heads flow so well? They do flow good but from what Ive seen they flow right around 310-320cfm on the intake side and a tick over 200 on the exhaust from .500-.600 lit side. A standard ls3 flows around 300-312 and the same 200 on the exhaust. Mid range lift numbers are very close as well. 10-15 cfm is a decent amount but then again it really isnt that much for a totally new head design and it certainly wouldnt make me do a complete conversion.

The hp and torque bump comes from the increased compression and DI controlling the fuel. The di bungs actually inhibit head flow a smidge since it forces the port to be shaped a little different then it would ideally be. But still a great flowing head at the end of the day.

and i agree i think you will need a standalone pcm. The new e92 pcm tuns the engine a whole new way, much different than the gen III/IV pcms.

Paul Bell

iTrader: (9)

As I understood it, the incoming fuel squirt right into the chamber cools it and is what allowed the higher compression ratio. Plugging the injector port and going to a manifold injector removes the cooling effect-which will necessitate a lower compression ratio.

Brian Hoss

Ah this is a little clearer now...

The injector doesn't fire directly into the chamber. It fires directly at the intake valve in the runner. So, no 2000psi fuel system is needed. Retains the LS fuel system, ECU. Makes this a much easier swap to these heads and LT1 intake.a. Now to wait a couple months for some initial power numbers.

dr_whigham

iTrader: (49)

I'm just in disbelief that MSD of all companies made an INTAKE MANIFOLD.

Red is Faster

These heads are surely designed for direct injection - namely that only air would be flowing through the intake ports rather than air and fuel. Some of the difficulties with retrofitting direct injection have already been mentioned, and I wouldn't be surprised if these heads aren't so impressive when you try to use them with port injection. Still, I'm curious to see results.

Brian Hoss

MSD started as a fuel injection company. With the Atomic EFI release a couple years back and the number one unit on the market, it's not that far a stretch to make the intakes too!

MuhThugga

Wouldn't that just make it an LS3 head in which no manufacturer's headers will fit due to the valves swapping spots?

LS1nut346

That makes more sense. While it's doubtful i would ever do this to my car, I'll be anxiously awaiting results of this. We'll see if it's truly a game changer or not

The Alchemist

iTrader: (19)

I walked SEMA for three straight days, for a good 7-8 hours each day, and over 10 miles each day, and missed this. There is just so much at SEMA, it's hard to catch everything.

01ssreda4

iTrader: (96)

^^^^understatement!

Project GatTagO

iTrader: (7)

The plate next to the head reads that existing exhaust manifolds will work.

The extra power is from better valve angles and canted valves.

Andrew

Sales@Tick

iTrader: (3)

Novel idea for sure.

TT427

iTrader: (1)

The injector is in the chamber on an LT1 head.

LS1nut346

Right. They would probably have to plug that hole and then there would be other injector holes on the intake.

TT427

iTrader: (1)

What benefit is there to this head then? Even ported its a little underwhelming compared to whats out there.

Paul Bell

iTrader: (9)

EXACTLY.

The head on the new LT1 engine is just part of the puzzle. I feel that the injector squirting in just the right direction creates just the right swirl in the chamber and cools the charge. Even the piston has that slot in it for the squirt. Use this head but go backwards to port injection and you might as well stay with the GenIII/IV offerings that have been perfected over the years.

You might spend A TON of money getting LT1 heads on an LS block but without everything else, you won't see better gains then can be had with the LS heads out there.

dckmn52

This.

KCS basically summed it up earlier. Might as well just get a Gen V engine if you want DI. Technically if you wanted DI with this head i guess a MegaSquirt would solve the engine management problem but i guess DI isnt really on top of the to do list for modification.

I heard a rumor from a pro stock porter (no names involved) that the LT1 head overall wasnt anything to brag about. Slightly disappointing to hear.

So all in all, I think ill pass.